Compilare: user.cpp:15:21: warning: left operand of comma operator has no effect [-Wunused-value] int b[200][200]={(0,0)}; ^ user.cpp: In function ‘int main()’: user.cpp:19:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:23:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &a[i].x, &a[i].y, &a[i].r); ^